Randomized Comparison of the Abbott WHITESTAR Signature System With Ellips Tranversal Ultrasound vs. the Alcon Infiniti With the Ozil Torsional Handpiece in Phacoemulsification: A Contralaterally-Controlled Trial

Inclusion Criteria: * Patients at least 21 scheduled to undergo bilateral phacoemulsification with implantation of multifocal IOLs. * Both eyes must have similar degrees of cataract and astigmatism (topographic cylinder difference of \<2.00D as well as similar globe axial length as measured by the IOL Master of \<0.5mm). * Visual potential of UCVA 20/25/ or better. * Clear intraocular media other than cataract. Exclusion Criteria: * Clinically relevant differences between eyes in ocular disease or pathology. * Presence of glaucoma, macular disease, or foveal disease to an asymmetrical degree. * Asymmetrical use of ocular medications.